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Signal processing method for MIMO (Multiple-Input Multiple-Output) sky-wave OTHR (Over-the-horizon Radar)

An over-the-horizon radar and signal processing technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as reducing the working performance of sky wave OTHR

Inactive Publication Date: 2015-01-07
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0003] Skywave OTHR uses the ionosphere to detect long-distance targets below the horizon, but the complex characteristics of the ionosphere and the special working mode of Skywave OTHR make the signal processing and data processing of Skywave OTHR face many problems that need to be solved urgently
The multi-path and multi-mode effects caused by the ionosphere seriously degrade the working performance of sky-wave OTHR

Method used

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  • Signal processing method for MIMO (Multiple-Input Multiple-Output) sky-wave OTHR (Over-the-horizon Radar)
  • Signal processing method for MIMO (Multiple-Input Multiple-Output) sky-wave OTHR (Over-the-horizon Radar)
  • Signal processing method for MIMO (Multiple-Input Multiple-Output) sky-wave OTHR (Over-the-horizon Radar)

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Embodiment Construction

[0026] Due to the layered nature of the ionosphere, the OTHR transmission signal may be reflected in different layers of the ionosphere, forming multiple propagation paths from the radar to the target, resulting in multiple echoes corresponding to the same target received by the radar receiving end, which is The so-called multipath effect. The multipath effect leads to false targets during OTHR signal processing, seriously affecting its performance. Considering that the multipath echoes have different DoD (beam departure angle) or DoA (beam angle of arrival) in the elevation direction, adaptive beamforming is generally used to filter out the multipath echoes. Due to the characteristics of the phased array system, the traditional OTHR cannot form an effective transmitting beam, so it is difficult to eliminate the influence of multipath echo. For example, assuming that the OTHR transmission signal may be reflected in the ionosphere E and F layers, and there is only a single hop...

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Abstract

The invention provides a signal processing method for an MIMO (Multiple-Input Multiple-Output) sky-wave OTHR (Over-the-horizon Radar). By utilizing the advantages that an MIMO-OTHR distinguishes multi-path echoes of a target, the multi-path echoes of a target are separated at the signal processing end of the MIMO-OTHR, so that an association relationship between the multi-path measurement of the target and propagation paths is obtained, and the processing complexity of OTHR data is greatly reduced by virtue of the multi-path measurement and the propagation paths. Compared with a conventional OTHR data processing mode, a data processing mode of the separated multi-path echoes through the MIMO-OTHR has the advantages that the calculated amount is greatly decreased, and the two modes are not obviously different in accuracy.

Description

【Technical field】 [0001] The invention relates to a signal processing method for sky-wave over-the-horizon radar, in particular to a signal processing method for sky-wave over-the-horizon radar under the multi-input and multi-output system. 【Background technique】 [0002] Over-the-horizon radar (OTHR) is a radar that can overcome the detection distance limit brought by the line-of-sight and can detect ultra-long-distance targets below the line-of-sight. According to different signal propagation paths, OTHR can be divided into sky wave OTHR and ground wave OTHR. The sky-wave OTHR signal irradiates the target below the line-of-sight through the reflection of the ionosphere, and returns to the receiving end of the sky-wave OTHR through the secondary reflection of the ionosphere to detect the target below the line-of-sight. Because over-the-horizon radar can detect targets below the line-of-sight, it has a long range of action and a large coverage area. It has an important earl...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/411
Inventor 罗杨
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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